package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetMealDishMapper setMealDishMapper;
    @Autowired
    private SetMealMapper setmealMapper;
    /**
     * 新增菜品并保存对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //向菜品表插入一条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);
        //获取生成的主键
        Long id = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        flavors.forEach(f -> f.setDishId(id));
        //向口味表插入n条数据
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 删除菜品
     *
     * @param ids
     * @return
     */
    @Override
    @Transactional
    public void delete(List<Long> ids) {
        // 判断能否删除菜品----是否有正在起售的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断能否删除菜品----是否有被套餐关联的菜品
        List<Long> setMealIds = setMealDishMapper.getSetMealByDishIds(ids);
        if (setMealIds != null && !setMealIds.isEmpty()) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品(批量删除)
        dishMapper.deleteBatch(ids);
        //删除菜品关联的口味(批量删除)
        dishFlavorMapper.deleteBatch(ids);
    }

    @Override
    public DishVO getById(Long id) {
        //先查询菜品信息
        Dish dish = dishMapper.getById(id);
        //再查询口味信息
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //拼接返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品信息，并修改关联的口味信息
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        //先修改菜品信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        //在删除菜品对应的口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //再插入菜品对应的口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(f -> f.setDishId(dishDTO.getId()));
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 启用或禁用菜品
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //更新菜品销售状态
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);

        //如果是禁用的话需要禁用掉该菜品相关的套餐
        if (status == StatusConstant.DISABLE){
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            //获取所有关联套餐的id
            List<Long> setMealIds = setMealDishMapper.getSetMealByDishIds(dishIds);
            if (setMealIds != null && !setMealIds.isEmpty()){
                //禁用所有的关联套餐
                for (Long setMealId : setMealIds) {
                    Setmeal setMeal = Setmeal.builder()
                            .id(setMealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setMeal);
                }

            }

        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        List<Dish> dishList = dishMapper.list(dish);
        return dishList;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
